Duplex adding machine



Jan. 26, 1937.

W. A. ANDERSON DUPLEX ADDING MACHINE y Filed Jan. 6, 1933 3 Sheets-Sheet l Jan. 26, 1937.' t w A. ANDERSON 2,068,650

DUPLEX ADDING MACHI NE Filed Jan. 6, 1933 5 Sheets-Sheet 2 'B' TOTAL. KEY

DE PQELSSED Jan. 26, `1937. w. A. ANDERSON DUPLEX ADDING MACHINE Filed Jan. 6, 1933 3 Sheets-Sheet 3 NMX.

Patented Jan. 26, 1937 DUPLEX ADDING MACHINE Walter A. Anderson, Rockford, Ill., assgnor, by

mesne assignments,

to Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application January 6,

13 Claims.

This invention relates to two-totalizer or duplex adding machines. Among the salient objects of the invention are to provide for automatically placing both totalizers in use for addition; for automatically selecting one of the totalizers for totaling; for manually selecting the other totalizer for totaling; and for automatically taking the total from whichever totalizer has been selected for totaling.

In the accompanying drawings:

Figure 1 is a fragmental right-hand side elevation of one form of machine embodying my invention, the parts being shown in the position occupied after a blank or spacing cycle of operations has been performed, and the upper totalizer being conditioned for the taking of a total.

Fig. 2 is a fragmental plan view of the stopsetting mechanism and the spacing-stroke-enforcing mechanism.

Fig. 3 is a fragmental perspective View of some'A of the parts shown in Fig. 2.

Fig. 4 is a fragmental perspective view of the totalizer-selecting mechanisms and the keyboard lock.

Fig. 5 is a fragmental left-hand side elevation of the machine.

Figs. 6, 7 and 8 are detail views of certain parts shown in Fig. 5.

Fig. 9 illustrates a specimen of work produced on the machine.

In the embodiment herein shown of the invention, the keyboard, the stops and stop-setting mechanism, the blank-cycle-enforcing mechanism and the printing mechanism are similar to those fully disclosed in the Sundstrand Patent No. 1,583,102 datedMay 4, 1926. This patent shows a machine having a single totalizer or register for accumulating amounts additively. The present machine has two totalizers, together with means for selecting either totalizer for totaltaking pLuposes, and in these respects it is similar to the machine shownin the Sundstrand application Serial No. 236,575 led November 29, 1927 (now Patent No. 1,946,505, dated Feb. 13, 1934). In that application, however, either or both of the totalizers may be used to accumulate amounts either additively or subtractively, whereas in the present machine direct subtraction cannot be performed, and both of the totalizers are always used in item-entering operations.

In the drawings, 2 denotes the platen, and 3 the vertically reciprocatory type bars; I9 are two levers pivoted at 20 and connected through links 23 to two crank arms 25 (only one of which 1933, serial No. 650,394y

(Cl. 23S-60) crank arms is shown in the present drawings); 26 is the main rock shaft to which said crank arms 25 are secured; 2l is a handle for actuating the machine (it being understood that a motor may be used, if desired); 42 are the stops for limiting the upward movement of the type bars in item-printing or adding operations; and 46 are the pins connected to the type bars and arranged to be arrested by said stops. The pins 46 are guided for vertical movement in a slide 41 which is movable transversely of the machine.

Means is provided to enforce the performance of a blank or spacing cycle of operations prior to the taking of a total. This means comprises a detent plateylld (Figs. 1 and 2) guided to move forward and back in a horizontal plane, said plate being connected through a bar 49 (Figs. 1 and 4) to a frame 50. rIyhe frame 50 is mounted to swing on the axis 5i (Fig. 1) and is normally impelled vforward by springs 52 (only one of which is shown in the present drawings).

A plate 53 (Fig. 3) pivoted in the machine frame at 54 is provided With a lug 55 at its lower edge. A lug 56 on the detent plate 48 is continually held in contact with the lug 55 through the action of the springs 52. Whenever a numeral key is depressed to set up the first digit of an item, the detent plate 40 is pushed back into position to prevent the pins 46 from rising. This result is eiected by means comprising a lever 51 pivoted in the framework at 5B, one arm of which lever is arranged to engage the lug 55 and thus move the detent plate rearwardly into position to prevent the printing of a total. The other arm of said lever is arranged to be moved by a universal bar 59 which is arranged to be moved counterclockwise, as viewed in Fig. 2, whenever a numeral key is depressed. The connections between the numeral keys and the universal bar 59 may be similar to those fully disclosed in said Patent No. 1,583,102.

The detent plate 46 is held in its rearward position against the force exerted by the springs 52 by means of a latch 60 (Fig. 3) pivoted at 6I and having a V-shaped tooth 62 which is held in contact with the plate 53 by means of a contractile spring 53. When the lever 5l is operated in the setting up of the irst digit of an item, the plate 53 is forced rearwardly of the point of the tooth and is held there by the pressure of the latch.

1n order to remove the detent plate 48 from its effective position during the blank or spacing cycle, the following means is provided: The plate 53 carries a lever 64 pivoted at 65 and having a projection 66 adapted to be struck by a projection 61 on the arm 25 fixed to the main rock shaft 26 of the machine. When the projection 86 is struck by the projection 61, the plate 53 is forced forward and away from the detent plate 48, thus releasing the latter to the action of the springs 52. In order that the projection 61 shall not release the detent plate 48 to the action of the springs 52 during the printing of an item, but shall release the detent plate only during the blank or spacing cycle, the projection 65 is made movable into and out of the path of movement of the projection 61. An arm 68 of the lever 64 is arranged to abut a lug 69 on the slide 41. A contractile spring 10 tends to move the lever 64 in the direction to lower the projection 66 out of the path of movement of the projection 61. When the slide 41 is in its initial position, the projection 66 is held up in the path of movement of the projection 61. When a digit is set up by the depression of a numeral key, the resulting movement of the slide 41 causes the projection 66 to be lowered out of the path of movement of the projection 61. When the slide 41 is returned to its initial position (as it is before a total is to be printed), the projection 66 is raised into the path of the projection 61, and is struck by the projection 61 during the next cycle of operations as described in Patent No. 1,583,102: page 5, lines 50-62, thus conditioning the machine for the taking of a total in the following cycle of operations. The movement of the detent plate 48 into its forward position to allow the pins 46 to rise also places the pawl 10a (Fig. 1) in position to allow the totalizer to remain in mesh with the racks during the upward movement of the latter. As will be understood from Figs. 1 and 4, the forward movement of the detent plate 48 results in forward movement of the swing frame 50, the latter having a pin 10b that lies in a slot in an arm 10c pivoted at 10d, the end of said arm being arranged to tilt the pawl 10a out of effective position and into the total-taking position shown in Fig. l. The parts 50, 10, 10b and 10c are old in the Sundstrand adding machine.

Referring now to the totalizers:

Each of the vertically reciprocatory type bars has a pair of racks 1| and 12 attached thereto. 13 and 14 are totalizers or registers arranged to be rotated by the racks 1| and 12, respectively, these totalizers being referred to hereinafter as the A totalizer and the B totalizer respectively. Each totalizer consists of a series of pinions rotatable upon a transverse shaft 15. The shafts 15 are supported for sliding movement to carry the totalizers into .und out of engagement with the racks. The totalizers are so moved by means including links 16 and 11 pivoted at their rear ends to levers 18 and 19 pivotally supported in the machine frame, and two links and 8|. In the forward end of each of the links 80 and 8| is an elongated opening 82 to receive a headed stud 83 on a slide 84. Said slide is suspended for reciprocation longitudinally of the machine, and is arranged to be reciprocated by means fully disclosed in said application Serial No. 236,575 to move the selected totalizer into and out of mesh with the racks to add or to take a final total. A spring 84a tends to move the links 80 and 8| forward to place the levers 18 and 19 in upright position and thus place the totalizers in neutral or idle position. The spring 84 is anchored at one end to a fixed point and is connected at its other end to a link 84b which is pivoted to the links 80 and8l. The link 84b merely serves to communicate power from the spring 84B to whichever link 80 or 8| is free to move forward.

When addition is to occur, two mechanisms come into operation, one to select the upper totalizer and the other to select the lower totalizer. The selecting mechanism associated with the upper totalizer comprises a camslide 85 mounted on the slide 84 for vertical adjustment. On the slide 85 are cam surfaces 86 and 81. When the slide 85 is in its upper or addition position, as shown in Fig. 1, it connes the forward end of the link 80 between itself and the stud 83 so as to compel said link to reciprocate with the slide 84, thus causing the upper totalizer to move into and out of mesh with the racks 1I. When the slide 85 is in such upper position, the cam surface 81 is up out of the way of the link 8| so as not to interfere with relative movement between said link and the slide 84.

The means for adjusting the cam slide 85 comprises a lever 88 which is pivoted in the stationary framework at 89. Said lever carries a pin 90 that lies in a horizontal slot 9| in the cam slide 85. A spring 92 normally holds the lever 88 in the position shown in Fig. 1.

The means for bringing the lower totalizer into use when addition is to be performed comprises a member 93 having a portion adapted to be interposed between the lower headed stud 94 on the link 8| The member 93 has a slot through which the stud 94 extends, said member being thus guided to move up and down. The lower end of the member 93 is pivoted at 95 to a crank arm 96 fixed on a shaft 91 which extends transversely through the machine frame. On the left-hand end of the shaft 91 is a device which virtually constitutes a yieldable crank arm, said device comprising a plate 98 (Fig. 5) xed on the shaft and a plate 99 pivoted on the plate 98 at |00. A spring IDI is anchored at one end to the plate 98 and is connected at its other end to a pin |02 on the plate 99. The spring IOI normally holds the pin |02 against the adjacent edge of the plate 98, the plates 98 and 99 thus normally moving as a unit. In order yieldingly to hold the member 93 in either of its two positions and to complete its movement into said positions, I provide a pivoted spring-actuated detent |03 having a stud adapted to lie in either of two notches in the plate 98.

To the crank arm composed of the parts 98 and 99 is pivoted at |04 a link |05 which is guided for substantially vertical reciprocation. The link |05 is arranged to be moved up and down to bring the member 93 into and out of effective position by means including a bell crank (see Fig. 6) pivoted in the machine frame on the axis |06. Said bell crank comprises an arm |01 having an elongated opening |08 to receive .c stud |09 on the link |05. The arm |01 carries a member having a yieldable cam surface III] and a dwell arranged for engagement by a stud ||2 xed on the left-hand lever I9.

The surfaces ||0 and |II are formed on one arm of a lever ||3 (Fig. 7) which is pivoted to the arm |01 at ||4. A spring ||5 stretched between the other arm of the lever 3 and a pin ||6 on the arm |01 normally holds said lever I|3 with a stop portion ||1 on said lever in contact with the pin I 09. Rigid with the arm |01 is an upwardly extending arm ||8 carrying a dog ||9 which is yieldingly held against a stop lug |20 on the arm ||8 by a torsion spring |2I. On the adjacent lever I9 is a stud |22 to engage stud 83 and a:

the dog ||9 in the downward movement of said stud. In the upward movement of said stud the dog ||8 is free to yield to allow the stud |22 to pass without causing movement of the 'bell crank |01--||8.

It will be seen that the stud |22 is adapted to cause upward movement of the link for the purpose of withdrawing the upper portion of the member 93 from between the studs 83 and 94, and that the stud ||2 is arranged to cause downward movement of the link |05 for the purpose of inserting the upper portion of the member 93 between the studs 83 and 94 and thus causing the link 8| to move with the slide 84 and thereby bring the lower totalizer into use. However, the studs ||2 and |22 must not be allowed to exercise control over the lower totalizer when a total is to be taken from the upper totalizer. Means is therefore provided to deprive the studs H2 and |22 of control of the lower totalizer. which means includes a latch |23 (Figs. 5 and 8) pivoted at |24 and adapted to engage a notch |25 in the link |05. The latch |23 is yieldingly connected to an operating rod |25 by means of a spring |21 that tends to hold the latch against a collar |28 on the rod. The forward end of the rod |26 is pivoted on a stud |29 on an arm |39, which is pivoted at |3I. A spring |32 tends to swing the arm |30 rearwardly so as to push the latch |23 away from the link |05. |33 is a slide bar that serves to restore the stops 42 to initial position as fully explained in the Sundstrand Patent No. 1,198,487, dated September 19, 1916. Rigid with the arm |30 is an arm |34 having a cam portion that is held depressed by a roller |36 on the slide bar |33 when the latter is in its forward position, this being the position occupied when a total is to be taken. When a digit is set up in the keyboard preparatory to adding an item, the slide |33 is moved rearwardly far enough to withdraw the roller |36 from the cam portion |35, thus permitting the spring |32 to withdraw the latch |23 and thus allowing the movement of the arm |01 by the stud ||2 to lower the link |05 to raise the member 93 to cause engagement of the lower totalizer, as well as the upper, for addition. At the first part of the cycle, stud |22 caused counter clockwise rotation of the arm |01 to the position shown in Figure '5, to withdraw the member 93 from its operative position. Shortly thereafter, stud ||2 engaged the cam surface |0 to restore the member 93 to its operative position.

When a total is to be taken the slide bar |33 is always in its forward position, hence the latch |23 is held against the link |05 in readiness to slip into the notch |25 during the blank or spacing cycle that precedes the total-taking cycle, and therefore the stud ||2 is prevented from raising the member 93 into operative position and the lower totalizer remains idle while the total contained in the upper totalizer is being printed. During such a blank cycle the counter clockwise movement of arm |01, caused by stud |22, raises the link |05 to the position shown in Figure 5, where the latch |23 drops into the notch |25. Continued operation of the machine brings the stud ||2 against cam surface ||0 as usual, but since the link |05 is now held against downward movement by the latch |23, the arm |01 is held stationary, causing the lever ||3 to be rotated clockwise about its pivot ||4, tensioning the spring |I5.

Totals may be automatically taken from the upper totalizer following the performance of a blank or spacing cycle, that is to say, without the necessity of depressing a total key. The means whereby the detent plate 48 is placed in its forward or ineffective position during the latter part of the blank or spacing cycle of operations has been explained, and it will therefore be understood that in a cycle immediately following a blank cycle, the type bars will be free to rise, and since the upper totalizer is then in mesh with the racks 1| and the lower totalizer is in idle position, the total contained in the upper totalizer will be printed.

In the present embodiment o-f the invention, all totals are final totals. The means for withdrawing the counter from the racks just before the latter descend (whereby to leave the pinions standing at Zero) may be of any preferred construction, as, for example, that fully described in the Sundstrand application Serial No. 670,665 filed October 25, 1923 (now Patent No. 1,965,611, dated July 10, 1934). Herein I have shown only a portion of such means, principally the lever |12, as reference may be made to said application for a full understanding thereof.

When a total is tobe taken from the lower or totalizer, that totalizer must be placed in use and the upper or A" totalizer must be rendered idle. These results are attained by moving the controlling slide 85 tol its lower position (as shown in Fig. 4), wherein the cam surface 86 is down far enough to allow the spring 84a (Fig. 1) to draw the link 80 forward to place the lever 18 in vertical position, thereby placing the upper totalizer in neutral position. When the control slide 85 is in its lower position, said slide confines the forward end of the link 8| between itself and the stud 83 thereby compelling the link 8| to reciprocate with the slide 84 in the cycling of the machine.

The meansfor placing the control slide in its lower position comprises a B total key |31 having a stem |38 which isguided for vertical movement and which is normally held in its upper position by means of a spring |39. On the key stem |38 is a pin |40 (Fig. l) that bears against an arm |4| which is pivoted at |42. Rigid with the arm |4| is a downwardly extending arm |43 having a pin-and-slot connection with the forward end of a link |44. The rear end of the link |44 is slotted, as at |45, so that it may be guided on the stud 89 for reciprocation. Rising from the link |44 is an arm |46 that bears against an adjustable stop |41 on the lever 88. It will be seen that as the B total key is depressed, the

link |44 will be pushed rearwardly, thereby rocking the lever 88 on its axis 89 and thus moving the control slide 85 intoits lower position, as shown in Fig. 4. The slide 85 is held in such position by means herein shown as comprising a hooked arm |48 which is rigid with the arms |4| and |43 an-d which is swung into position above a pin |49 on the key stem |38 when the B total key is depressed. The latch arm |48 is held in such position by means of a latch iinger |50 beneath which the forward end of the arm |4| engages when the B" total key is depressed. The latch finger |50 is xed to the righthand end of a rock shaft |5|. To the left-hand end of the shaft |5| is fixed a finger |52 (Fig. 5) which is in position to be engaged by the roller stud |36. A spring |53 tends to move the latch finger |50 into position to restrain the arm |4| after the latter has been depressed below the lower end of said latch nger. At the completion of any cycle, the slide bar |33 is moved forward far enough to disengage the latch finger |50 from the arm I4|, after which the slide bar |33 moves rearwardly far enough to allow the spring |53 again to place the latch finger |50 in position to restrain the arm |4| the next time said arm is depressed.

When the latch finger |50 releases the arm |4I, a spring |54 (Fig. l) draws the slide |44 forward, thus allowing the spring 92 to raise the control slide 85 to its upper position and withdrawing the latch arm |48 from the pin |49, whereupon the spring |39 restores the B total key to its normal position.

Means is provided to prevent the "B" total key from being depressed after an item has been set up in the keyboard and prior to the performance of a spacing or blank cycle of operations. The means herein shown for this purpose comprises a link |55 (Figs. 1 and 4) pivoted at its rear end to the swing frame 50. The forward end of the link |55 is bent into vertical position to form a pin |56. The pin |56 extends up through a slotted guide |51 which is rigidlyy secured to the key stem |38, whereby the link |55 is guided to slide forward and back. An angular lug |58 rigid with the key stem |38 extends intoposition to overlie the upper end of the pin |56 i when the swing frame 50 is in its rearward position, as it is after an item is set up in the keyboard and until near the end of a blank cycle of operations. It will thus be seen that the B total key cannot be depressed to condition the B totalizer for the taking ofa total until after a blank cycle of operations has been performed. Near the end of a blank cycle of operations the swing frame 50 moves into its forward position, thus placing the pin |56 forwardly of the lug |58 so that the B total key may be depressed, as shown in Fig. 4.

Means is provided to prevent the keyboard from being used to set up a number in the machine after the B" total key is depressed. The means herein shown for this purpose comprises elements well known in the Sundstrand adding machine and includes a locking plate |59 (Figs. 1 and 4) mounted below the keyboard for reciprocation forwardly and rearwardly in the machine. In this plate is a slot |60 for each numeral key stem |6I, only one of these key stems being shown in the present drawings. Each key stem IBI has a lug |62 to overlie the locking plate |59 when said plate is in its forward position, as shown in Fig. 4, and thus prevent depression ol the numeral keys. Fixed to the locking plate |59 is a stud |63 having a tapered surface adapted to be engaged by a cam lug |64 on the lower end of the B total key stem |38. It will be seen that when the B total key is depressed, the locking plate |59 will be moved into its forward position to lock the numeral keys against depression. It is thus impossible to add in only one totalizer, as the keyboard will become locked when the B total key is depressed in an effort to select the B totalizer for use in addition, and to place the A totalizer in idle position.

A B" total may be taken before or after an A total. If taking a B total first, a blank cycle is performed, after which the B total key is depressed and held latched down by the latch finger |50. The next cycle will then give the "B total, the B total key being automatically released at the end of the B total cycle. When the B total key is thus released, the spring 92 restores the control slide 85 to the position shown in Fig. l, thereby placing the A totalizer in use. The next succeeding cycle will then give the A total.

If the A total is'desired first, it will be obtained automatically after the spacing cycle, as the A totalizer is the only one which is then in use, the B totalizer being held out of operation by the latch |23 that controls the interponent 93. After the A total has been taken, the By total may be taken in the next succeeding cycle by rst depressing the B total key.

As hereinb'efore stated, a total may be automatically taken from the upper ory A totalizer after a blank cycle and without the necessity of depressing a total key. In fact, there is no total key for the A totalizer. It will thus be seen that the present machine will give a total from the A totalizer by merely cycling the machine twice in succession.

lThe key |37 herein termed the B" total key is in the nature of a totalizer-selecting key, rather than a total key, as it does not determine whether the engagement between the racks and the totalizcr shall be of the adding or the totaling type. The detent plate 48 and the paw] l0*l are automatically placed in position to allow totals to be taken. as hereinbefore described, from whichever totalizer is selected.

It will be understood that various changes may I' be made without departing from the spirit and scope of the invention as set forth in the appended claims.

I claim as my invention:

l. A computing machine having, in coinbina- 5` tion, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a control member having one position wherein it selects one totalizer and another position wherein it selects the other totalizer, means for automatically enabling said other totalizer when an item is set up, means for automatically disabling said automatic enabling means when no item is set up, and a key and connections for moving said control member into its secondmentioned position.

2. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a control member having one position wherein it selects one totalizer and another position wherein it selects the other totalizer, means for automatically enabling said other totalizer when an item is set up, means for automatically disabling said automatic enabling means when no item is set up, manual means for selecting said other totalizer, and means to disable said manual means when an item is set up.

3. A computing machine having in combination, an item-setting keyboard, two totalizers, means for actuating the totalizers in accumulating and totaling operations, and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a control member having one position wherein it selects one totalizer and another position wherein it selects the` other totalizer, means for enabling said other'totalizer when an item is set up, means for automatically disabling said enabling means when no item is set up, and manual means for operating said control member to select said other totalizer.

4. A computing machine having, in combination, an item-setting keyboard; ltwo totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentoned means including a control member having one position wherein it selects one totalizer and another position wherein it selects the other totalzer, means for enabling said other totalizer when an item is set up, means for automatically disabling said enabling means When no item is set up, means for selecting said other totalizer for a totaling operation, and means to prevent such selection of said other totalizer when an item is set up.

5. A computing machine, having, in combination, an item-Setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations, one of said totalizers being always in use in accumulating operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including means for automatically enabling the other totalizer when an item is set up, and means for automatically disabling said automatic enabling means when no item is set up.

6. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in totaling operations; the last mentioned means including means tending automatically to select one totalizer, manual means to select the other totalizer, and means to disable said'manual means when an item is set up.

7. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a spring tending to select one totalizer and place the other totalizer out of use, means for enabling the other totalizer for an accumulating operation, manual means for selecting said other totalizer for a totaling operation, and means to disable said manual means when an item is set up.

8. A computing machine having, in combination, an item-setting keyboard; two totalizers;

means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a spring tending to select one totalizer and place the other totalizer out of use, means for automatically enabling the other totalizer when an item is set up, means for automatically disabling said automatic enabling means when no item is set up, manual means for selecting said other totalizer for a totaling operation, and means to disable said manual means when an item is set up.

9. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a spring tending to select one totalizer and place the other totalizer out of use, means for automatically enabling the other totalizer when an item is set up, and means for automatically disabling said automatic enabling means when no item is set up.

10. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a spring tending to select one totalizer and place the other totalizer out of use, and means for automatically enabling the other totalizer when an item is set up.

11. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations, one of said totalizers being always in use in accumulating operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including meansl for automatically enabling the other totalizer when an item is set up.

12. A computing machine having, in combination, an item-setting keyboard; two totalizers; means for actuating the totalizers in accumulating and totaling operations; and means for controlling the totalizers in accumulating and totaling operations, the last mentioned means including a control member having one position wherein it selects one totalizer only and another position wherein it selects the other totalizer only, a spring tending to move the control member into the first mentioned position, means for automatically enabling said other totalizer when an item is set up, means for automatically disabling said automatic enabling means when no item is set up, manual means for selecting said other totalizer for totaling, and means to disable said manual means when an item is set up.

13. A computing machine having, in combination, tWo totalizers, one of which is always enabled for use when accumulating, a keyboard,

means controlled by the entering ofan item on the keyboard for placing the other totalizer in use. for accumulation, means for automatically enabling the rst mentioned totalizers for totaling, and manual means for enabling the other totalizers for totaling [and for rendering the first mentioned totalizers ineffective.

WALTER A. ANDERSON.

CERTIFICATE OF CORRECTION.

Patent No. 2,068,650. January 26, P937.

WALTER A. ANDERSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, second column, lines 58, SO and 6l respectively, claim l5, for the word "totalizers" read totalizer; and that the said Letters Patent should be read with these correctionstherein that the same may Conform to the record of the Case in the Patent Of'fioe.

Signed and sealed this 11th day of May, A. D. 193'?.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

